That version is the steel version. The struts are rubber coated steel as and the pivot block is steel. There is also a plastic stock for the micro as well.
They run from $140 to $250 for the stock. I got a few fropm ORF back when they were going under so I used it for this build.
There was a fellow selling the R4 Galil stocks for like $40 on AKFILES., no buttpad. He may have more?WTS: Galil / R4 Folding Stocks ALL SPF! - The AK Files Forums